Abstract: The object of this research is the international and domestic legal regulation in the area of dual citizenship. The subject is the dual citizenship. The issue of dual citizenship is currently relevant not only for Russian Federation, but also many other countries. The current models of legal regulation of dual citizenship greatly differ from country to country, without meeting the needs of the individual in the modern world and causing many collisions in the legal systems. The authors analyze international law and national models of regulation of the question of dual citizenship, primarily from the positions of human rights. The novelty of this research partially consists in account of the latest trends in domestic policy of a number of countries on the question of dual citizenship. The work reveals the peculiarities of the legal regulation of dual citizenship within the framework of integrated union states. Special attention is given to the evolution of legislation in Russia. The authors conclude that in the modern world of agitated global political processes, the issues resulting from simultaneous belonging to different legal systems due to citizenship require modernization of approaches to the established models of legal regulation and development of clear definitions in both international and domestic laws.